How to check for EVAP Leaks?

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Monitoring for Leaks and Proper System Operation:

As was mentioned earlier, all vehicles built after 1999 have enhanced EVAP systems which will perform self-tests for both leaks and proper system operation. This test sequence is named because of the EVAP monitor.

The monitoring strategy will vary, counting on the kind of car.

Here is an example of an oversized leak test, which is one portion of the EVAP monitoring strategy, from a 2010 Chevy Silverado:

  1. When the conditions are correct, the control module closes the vent valve and opens the purge valve, creating a vacuum within the system.
  2. The control module then monitors the fuel tank pressure (FTP) sensor to verify the system can reach a specified amount of vacuum.
  3. If the vacuum is less than specified, the module assumes there’s an oversized leak somewhere within the system and stores a DTC in its memory.

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